Heavy duty steel brackets

Posted by edwardjohnson on December 24th, 2018

Mechanical or manual handling of industrial trolleys intended for heavy duty loads requires products manufactured with materials suitable for these purposes.

The right brackets for heavy duty handling (h2)

In addition to the criteria for choosing industrial wheels, it is particularly important to consider the right bracket to be combined with the wheels, as not all the brackets are able to withstand shocks and stresses related to mechanical handling.

Please be reminded that the bracket is the connection element between wheel and trolley. Normally, all wheels require the use of a bracket to be applied to the trolley or equipment, except for wheels whose axle is integrated into the trolley itself.

It is recommended to always consider the loading capacity of the Wheel + bracket assembly, which is limited by the weakest element of the assembly (for example: if the wheel has a loading capacity of 500 kg and is fitted with a bracket with loading capacity of 300 kg, the wheel + bracket assembly has a loading capacity of 300 kg).

Therefore it is important to address a technical partner able to provide, in addition to the wheels, also the right brackets for each industrial context.

For heavy duty loads a leading company like Tellure Rôta can provide suitable brackets for manual or mechanical handling, such as P and PX brackets, for low intensities, PT brackets, with hardened ball race grooves, and EP brackets, for extra heavy duty loads. In all these cases, it is important to take into account that the speed of the trolley must not exceed 6 km/h.

If the customer needs require mechanical handling at greater speed, electrowelded EE brackets, twin electrowelded EEG brackets and electrowelded sprung-loaded EES brackets are available for mechanical handling speed up to 16 km/h.

For usage speeds greater than 16 km/h, instead, it is necessary to contact the company for a dedicated consultation.

What are the most used bracket types?

Let's analyse the features of each one.

P and PX brackets

P bracket guarantees high load capacities that make it suitable for industrial applications (max 750 kg). Yellow colonial galvanisation guarantees a very high resistance to white salt corrosion in salt spray chamber (more than 72 hours). The versions available include those with plate connection. The front activation brake and the adjustable rear activation brake can be coupled. Instead, PX bracket consists of AISI 304 stainless steel components, and thus it is also suitable for use in environments with the presence of aggressive chemical agents.

Heavy-duty PT brackets with hardened ball race grooves (h2)

These are brackets designed for use in special conditions, such as:

• mechanical or manual/mechanical handling,

• recommended speed up to 6 km/h,

• high handling intensity,

• medium duty loads and mainly indoor.

The housing of the double ball edge inside carbon-hardened steel tracks guarantees precision in the rotation of the bracket even in the long term and after intense and heavy use, making this bracket resistant over time even to frequent mechanical handling.

EP bracket for extra heavy duty loads (h2)

This type of bracket is recommended for loads that can reach 1600 kg or for high speed applications. The presence of the two bearings ensures excellent manoeuvrability even with full load. The first - axial - bearing is a thrust bearing, the second - tapered - bearing resists to oblique thrusts.

Normally, this type of bracket requires no maintenance: in case of applications that require periodic greasing (continuous handling with mechanical means, very dusty environments...) it is possible to equip the bracket with greaser. It is possible to couple the adjustable rear activation brake.

Trolleys with autonomous movement system (h2)

In trolleys with autonomous movement system (trolleys with drive wheels - self-propelled trolleys), the wheels are directly connected to the trolley; therefore, no brackets are used for their assembly.

In these situations, the wheels are subjected to special stress.

The drive wheels, in fact, in addition to bearing the load, must allow the transmission of the tangential force, which allows the movement of the wheel and thus of the trolley.

In addition, the coating of drive wheels is subjected to greater stress.

In particular, when choosing wheels and brackets for self-propelled trolleys, the following elements must be carefully considered:

• type of bushing or bearing applied in the hub;
• hub/shaft coupling tolerances;
• hub material with respect to shaft material;
• frequency of starts and stops of the motion transmission component;
• reversal of the direction of motion;
• presence of - even temporary - overloads.

For more information about brackets and heavy-duty handling technologies, check this link: https://www.tellurerota.com/fr/solutions-antistatiques-et-conductiveshttps://www.tellurerota.com/en/product-range/industrial-heavy-duty-and-mechanical-handling